Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/46d9f41023ef
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #14984 from kumarrishav/issue-944287

Bug 944287 [UITEST] add Share URL activity, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/0d1dcd0365a2
Author: kumarrishav <reactiverishav007@gmail.com>
Desc: Bug 944287 [UITEST] add Share URL activity - bug fixed